Vertical axis cone and shell mill



055.7,1945 R, F', DAWS- 2,455,565

VERTICAL AXIS GONE AND SHELL` MILL i Filed May e, 1945 l i This invention relates to a grinding lor -pulverizing mill and hasfspecial reference to that type of small mill such` as used in testing laboratories in' the grinding andpulverizingiof'iron vor "otheri'ores prior to "analyzing" `samer i `1 e 2 i This general `typefof s"mall` rnill `is quite loldand in` common use,"` however quite crudely assembled' and of common noisyV bevel gear power transmise sion partsand with crude means forcoinpensating for wear and "adjustabilityr- IThe principal object of the instantinventionis tofprovid'e much more satisfactory instrumentalitydf greater longevity and much `,finer `adjustment "forlfun'i-f formity of product lthan `the cominonJtypebi.` mill.l An important feature of',` theinvention ist bearing assembly for the main "arbor orfsfhaf ''f the mill wherebya single lubricationmay-*safely last for several months continuous operation of the mill." Another feature is `thesimple `and efilcient adjustment of the adjacent grinding surfaces of the plates which isreadi-Iy facconiplished lbyi `the manipulation of but a single ci'ivnien'tlylocated thumb screw.` i

Other Lobjects and the further description of the-invention. 5

`In the accompanying drawing;` formin this application,` Y Fig. 1 isa top plan view of thefmproved mill, with a portion of the upper partit of the ho broken away, Fie. 2 is avertical sectional view on'th 2 2, Fig.`1,

Fig.,3 is a transverse sectional view on the line 3-3, Fig. 2, rotated 180.

Fig. 4 is a broken elevational view of the lower portion of the mill housing showing the entrance to the grinding pit thereof,

Fig. 5 is a slightly enlarged central sectional view of the oil ring intermediate of the lower extremities of the sleeves 22 and 23 and abou the arbor I2.

In the drawings, the main housing of the mill comprises the upright hollow cylindrical portion advantages will appear I"in,

i j PATENT oNENn snLLfMILL atie', Hitting, Minn. i 1,' 1Q4aseriari-ra 67,558 v (c1. :er1-25s,)

`OFFICE y the form ofthe hollow cap-like inverted member 5 circular in .planview to` neatly set down` upon the similarly shaped `flanged terminus 6 of the portion l, and .whichcap is removably held in position uponthe iiange 6 -by any desired number of bolt`slsufch asindicated at 1. This is sur; mounted by the `freelymovable transverse adjustmentarrn 8 which will be described more specifically` laterV except that centrally thereof and withinthe throughholet therein` is rockably supported the ball-bearing cup I0 for `suspension of.` theupper` end Il of the grindingarbor I2 and upon which'upper threaded end is mounted the ballthrust bearing l3 `Above this bearing and screwqthreadedly mounted upon the portion II is the.Mlllst'ment nut I4 which has a lower conically shaped face to neatlyfit within the rounded face.- of `the inner edge of the upper raceway of thefbearng I3. i l 1 i- -,Here itfis `to be noted `that 'the arm 8 is free of movement lwith` one end loosely resting intermediate ;of `the `two up-standing lugs I5-I5 formed `integral with` the cap 5 adjacent the peripherally -upper edge of the cap 5cwhile at the opposite; end thelever 8 is bifurcated` as at IG throughthe hole I'I' 1in which the thumb bolt I8 isgmounted and outwardly ofwhich hold the split endoflthe arm is provided with a small tightening boltul so `that the normally iixed bias of the thumb ,nut may be` readily predetermined.

The opposite lower end of thel arbor I2 is also reduced and somewhat tapered as at 20 and carries `thereupon ;the,lowermost frustro-conically shaped :grinding plate2I i as' is ,commongin such "V" mins.

The elongated larger intermediate portion of the arbor I2 is rotatably carried within the elongated sleeve or bushing 22 which is fixed within the cylindrical portion I of the housing and is" removably telescoped within a similar sleeve 23 and which sleeve is provided with an elongated xed key 24 slidably operable within the keyway 25 in said arbor I2, this being to permit of ready downward removability of the arbor when other attachments thereupon are removed as for renewal, repair, or the like, and also free more delicate longitudinal adjustability of the arbor in relation to the size of pulverized product desired.

As a staunch and dependable bearing for the arbor I2, the opposite ends of the bearing sleeve 22 are stepped for reception of the outer races of the beveled roller bearings 26 at the upper end and 21 at the lower end and the opposite ends of l the sleeve 23 are also somewhat similarly stepped to permit of the application of the same roller bearings, these bearings being of the inclined raced type as clearly shown affording convenient adjustment thereof to compensate for wear by the movement, in this instance, of the inner race of said bearings by the shortening of the stepped area intermediate of the inner races of said bearings. This shortening process is accomplished when necessary by the adjustment of the `flat ring nut 28 locked in position by the like nut 29 both of which are threadedly mounted upon the uppermost stepped portion of the sleeve 23 thus proupwardly Abeyond lsaid first mentioned sleeve, a

viding most convenient and positive means for the simultaneous adjustment of both of said bear ings, it being understood that a suitable spring ring lock as shown at 30 is installed within asu'itkey xed to said second sleeve and extending inwardly within the bore thereof, an arbor carried within-said secondsleeve and having a portion thereofvextending outwardly therefrom at both ends, 'a keyway in said arbor leading from the able groove about the sleeve 23 'for normally.liold-Y ing the lower bearing 21 in place. v

Upon the upper end of the sleeve 23 and lthereabouts is installed as by keying or threading the V ltransmitting pulley. Thus the most'mode'rn and silent means of furnishing power to such a mill is provided, the same being as by'abelt associated with saidsheave or pulley 3l.

It being very essential to preventany foreign substance such as oil or the likeenteririg the grinding pit, I have provided adequate means in the way of an efficient oil ring as shown inFig.-5 wherein 32 represents a preferably rectangular shaped hollow metal ring containing aspecially shaped leather or other suitable gasket 33 `having a central upstanding portion biased laxially as indicated at 34 for contacting the outer walls of, and about the arbor I2. 35 represents an' endless helical contrastive spring member for installation within the keeper ring 32-before`applica tion of the oil ring to the'- arbor I2 Aand which is held against accidental removal as soon as the ring is applied about the arbor as clearly obvious.

In Fig. tis illustrated la convenientfform-of holding means for the product pan 3G `adjacent the cut-away recesses 31 on opposite sides ofthe outer wall .of the pit 3 for the holding bolts ofthe upper-most grinding ring `38, one of which bolts is shown at 39, said pan holding means comprising the bolt 1w impinging 'the xed end ofi-the arcuately shaped spring member 4I the'free end of which is engaged by the `opposed protruding pins `412, one oneither side of the 'pan, bbviously necessitating but a partial rotation` of the 'latter for connection or release of same. i

I claim:

1. As a new article of manufacture an ore grinding 'mill comprising av main housing having rsleevegfsaid second sleeve and arbor being ro lupper end thereof downwardly to engage said key,

a pulley iixed at the upper end of said second tatable by said pulley, a grinding ring carried at the lower endof said housing, a grindingfplate carried byfsaidarbor at the lower end thereof and -beingrotatable therewith.. saidy plate being cooperativewith said ring to grind said material, a pan carried by the lower end-of `said housing to catch the ground material, and means for adjustably supporting said Aarbor `within said second sleeve. n v v The-structure as kset forth yin claim` 1 and said-,last mentioned means vcomprising an adjustment arm carried above said, pulley, a thrust bearing pivotally carried by said arm, the/upper end of said arbor extending through said bearing,` an adjustment nut carried on the end of ,said

, arborv upwardly-of and by said bearing to support-said arbor, and means carried `by saidarm for-adjusting the vertical position of said arbor.

ROBERT F. nie-vrs.`

'REFERENCES CITED The 'following references are ofl record `in the file/of this patent: i l

UNITED STATES PATENTS- vBryant Jan. 19,1926 

